Improvement in haevestee



i nihil-tant @anni @fitta i IMPROVEMENT. IN HARVESII..ItA GUTTER-BARS.

dige ltlgehuh infant in in tiges liirttctt` mni mit milking part ni .tigt annie.

T0 ALL WHOM IT MAY CONCER Be it lknownthat I, THOMAS WELCH, of Churchvil'le, in the county of Monroe, and State of New York, have invented a new and useful Knife-Bar Head and Pitman Connection for Harvesters; and Ido hereby declare that the following is a full, clear, andexact description thereof, refe-rence being` had to the accompanying drawings, making part of this specification, in whichi Figure 1`is a horizontal section in the plane of the red line o in fig. 2, and showing a top view of the shank S.

Figure 2 is a transverse vertical section of the head H, taken in the plane of the red line 'n in fig. 1.

The nature of this invention consists' in the employment of a skeleton or shell knife bar head, provided w with a shank, by which it is riveted orotherwise attached to the knifefbar ofl harvesters, and in which head the boxes of thejournal of the pitman are held. It also consists, in combination with those parts, of a set-screw and jam-nuts for tighteningvup the parts, and thereby compensates for any wear.

To enable others to make and use my invention, I will describe its construction and operation.

1 f I make the hollow case orvhead H of malleable iron, or other suitable metal. It is cast with a core, leaving 4A "c fj'it closed on the top and bottom, with a circular opening, a, in each side for the wrist or journal on the end of i the pitman, which is shown by the dotted lines P, to work in, and a square opening, b, as deep, vertically, as the cavity of the head H. This opening is made to insert the boxes B andB through, and also the nnt t. There is also a round opening left in the end of the head to Vreceive the set-screw s loosely` The shank S is j Aprovided on the back side with a vertical rib, R, made the full depth ofthe head attheir junction, and runs out at or near the other end of the shank. After the boxes are inserted, the nntft is arranged to receive the screw s, the end of which should rest againstthe box B with suii'icient force to insure a proper fit between the parts. Such adjustment of the screw is cffectua-lly secured bythe jain-nut m being turned firmly against the head. n* The pitman may be kept in .positiouby the shoulder ordinarily provided on the front side of'thc cutter-bar or upon the shoe. When .metal boxes are used their sides may berounded, as shown in fig. 2, to p/ermit the slight changes that might occur in theldirection of the wrist of the pitman. Other materials or substances may be used for the boxes instead of metal, suoli as leather, rubber, felting, cork, wood, horn, tc., and when rubber, felting, or similar substances are used,l there should be a metal plate placed between the point of the' screw and the cushion or box. There may be a cushion of some yielding substance placed nt therback of t'h'e iron boxes, if desired, to relieve the parts from the concussions to which they are otherwise subjected. The box Bmay be dispensed with by making that part of the head to form the bor. The wrist ofthe pitman may be made oblong in the directioniof the draught, or flattened on the top and bottom, which will cause it to approach a circular form as it wears, and thereby work without cramping in the box. l i

What `I claim as my invention, and Adesire to secure by Letters Patent, is-.f-

1....The skeleton or shell-head ITI, constructed as described, in combination with the knife-bar of harvesters, substantially as and for thepurposes set forth. I

2. The arrangement of the skeleton or shell-head H with the boxes B and B, pitman P, and set-screw s,

s'ubs'tantially as and for the purposes set forth.

THOMAS WELCH.

Witnesses: y WM. S. Louonnonouen, i

EDWIN S. Corn. 

